<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    div {
        position: absolute;
        width: 100px;
        height: 100px;
        background-color: pink;
    }
</style>

<body>
    <div></div>
    <script>
        var div = document.querySelector('div');
        div.addEventListener('touchstart', function(e) {
                // 初始化坐标
                // 手指坐标
                var startX = 0;
                var startY = 0;
                //盒子位置
                var x = 0;
                var y = 0;
                // 获取手指坐标
                startX = e.targetTouches[0].pageX;
                startY = e.targetTouches[0].pageY;
                x = this.offsetLeft;
                y = this.offsetTop;
                div.addEventListener('touchmove', function(e) {
                    // 手指移动的距离
                    var moveX = e.targetTouches[0].pageX - startX;
                    var moveY = e.targetTouches[0].pageY - startY;
                    this.style.left = x + moveX + 'px';
                    this.style.top = y + moveY + 'px';
                    e.preventDefault();
                })
            })
           
    </script>
</body>

</html>